Furnace-door frame.



L. L. KNOX. FURNACE noon FRAME.

APPLICATION FILED JAN-10! 1914.

Patented Nov. 24, 1914.

2 snnn'rs sunnw 1.

-25 INVENTOR WAN Gum's L. L. KNOX.

FURNACE DOOR FRAME.

APPLICATION IILBD JAN.10. 1914.

Patented Nov. 24, 1914.

SHEET 2.

2 SHEETS-' )(gWhfESSl-IS Mam Q Q.

INVENTOR UNITED sTATEs ParENT OFFICE.

LUTHER L. KNOX, OF AVALON, PENNSYLVANIA, ASSIGNOR TO KNOX PRESSED &WELDED. STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

FURNACE-DOOR FRAME.

Specification of Letters Patent.

Patented Nov. 24, 1914.

Application filed January 10,1914. Serial No. 811,390.

new and useful Improvement in Furnace Door Frames, of which thefollowing is afull, clear, and exact description, reference being had tothe accompanying drawings, forming part of this" specification, 1n

7 which- Figure 1 is a front elevation partly broken away of one form offurnace door embodying my invention; Figs. 2, 3 and 4 through one of thedepending leg portions of the structure; Fig. 6 is a section on the 0line VIVI of Fig. 5, and Fig. 7 is aperspective view of the bottomconnecting or tie member of the structure.

My invention has relation to furnace door frames, and more particularlyto' hollow water-cooled frames constructed from sheet metal.

The object of my invention is to provide 21h frame of simple, eiiicientand durable construction.

In accordance with my invention, the upper or lintel portion of theframe 1s formed of a front plate 2, and a back plate 3. The front plate2 has its upper edge portion bent horizontally rearward, as shown at 4,to form the top wall of the structure, be-

ing welded at 5 to, the upper free edgeof edge portion bent horizontallyoutward, asv

shown at 8, to form the bottom wall of the structure, and is welded at 9to the lower flee edge of-the front plate 2. .This lower wall 8 may beeither straight or arched. In the drawing, I have shown it as arched.The back plate 3 also has its edge portions 10 bent forwardly atsubstantially right angles to form the side walls of the structure,these side walls being welded at 11 to the free vertical edges of the Ifront plate 2. 7

Each leg portion is formed by a downward extension 12 of the back leg 3and by a downward extension 13 of the front leg The downward exten ions12 arebent into substantially U-form with the U facing outwardly, asshown in Figs. 4. and 5, while the downward extension 13 fits betweenthe sate for this offset, the two legs of the U.

on the extension 12 are of unequal lengths.

The numeral 17 designates a hollow tie member which connects the legs attheir lower ends and which also acts to form the closed bottoms of thelegs. This tie member,

is preferably formed by a single piece of sheet metal shaped and bent ina manner substantially as indicated at Fig. 7, to form the hollowrectangular central portion having open ends, and with the endprojections 18 of the bottom member thereof. The free edges of the blankare welded on the line 18, and the extensions 18 are welded to thebottom edges of the legs. The inner walls of these legs are shorter thanthe outer walls and are welded to the top wall of the portion 17. Thisbottom member forms a substantial tic connection between the lower endsof the legs which effectively prevents their warping or twisting in use.V Any suitable means may be employed for effecting a water circulationthroughout the interior of the structure. In the drawing, I have shown,a water supply pipe 19, extending vertically downward through one-sideofthe lintel portion and thence into the atthe corresponding side,the lower end shown .a. 20,,within one end portion! of the tie member17. shown as having a perforated branch 21, extending within thelowerportion of the lintel over the bottom arch thereof. The heatingwater rises to anoutlet connection 22 at the top of the strlicture atthe opposite side to that where the supply pipe 19 enters.

23 indicates a suitable blow-out plug at the lower end portion of one ofthe legs, and 24. designates bracing connections, in the form of staybolts, for the front and back plates. 1 11,.

'My invention provides a strong, efficient and durable water-cooled doorframe structure which can be readily constructed from The pipe 19is'alsothis pipe being bent horizontally, as

sheet metal. The. blanks of which the structure is formed can be readilyshaped and united by Welding, thereby making a practically integralstructure 'of minimum weight. A continuous water circulation may bemaintained throughout the structure, thereby rendering it very durable.7

I do not wish to limit myself to the exact details of construction andarrangement of the parts, as shown and \described, for it is obviousthat various changes may be made therein, without departingfrom thespirit and. scope of my invention as defined in the appended claims;

I claim:

1.' A hollow waterrcooled furnace door frame, comprisingan upper orlintel portion formed of two sheet metal plates, one of said plateshaving its edge portions bent to form the side walls of the structure,and the other plate having its free edges united to said side walls andthe two plates having downward extensions united to form the hollow legportions' ofthe' structure, substantially as described.

2. A furnace door frame, comprising an upper or lintel portion formed oftwo sheet metal plates, one of which has its edge portions bent atsubstantially. right angles to form the side walls ofthe structure, theother plate having its free vertical edges united to said side walls,one of said plates having its upper edge portion bent horizon tally andsecured to the upper edge of the other plate to form, the top wall ofthe structure, and the second plate having its lower edge portion benthorizontally and secured to the lower edge of the first plate to formthe bottom wall ofthe structure, substantially as described.

3. A furnace door frame, comprising an upper or lintel portion formed oftwo sheet metal plates, one f which has its edge portions bent atsuistantially right angles to form the side walls of the structure, theother plate having its free vertical edges 7 united to said sidewalls,one of said plates having its upper edge portion bent horizons tally andsecured tothe upper edge of the other plate to form the top wall of thestructo the lower edge of the first'plate to form the bottom wall of thestructure, and saidpla'tes having downward extensions united ture, andthe second plate having its lower edge portion bent horizontally andsecured to form the hollow leg ortions of the structure, substantiallyas escribed.

4:. A furnace door frame, comprisingan bottom member uniting said legportions,

'said bottom member having end extens1ons secured to and formingclosures for the lower, ends of the legs, substantially as described.

6. A hollow furnace door frame, formed of sheet metal and havingdepending hollow legs, said legs being un1ted at their lower ends-by ahollow transverse tie member having' an interior water-circulating spacewhich communicates with the interior spaceof the legs and having itsbottom wall extended to form bottom closures for the legs,

substantially as described.

7. A hollow sheet metal furnace door side of the door opening, and atransverse tie member connecting the lower portions of saidlegs' at thebottom of said openm'g, sa1d of the legs, and having end extensionswhich aresecured to the open lower end portions of said legs to formbottom closures there-' for, substantially as described. In testimonywhereoifll have hereunto set my hand.

'- l Vitnesses:

H; M. @onwm,

frame having depending hollow legs at each:

tie member having a. water circulating space which communicates wlth thelnterior spaces LUTHER 1L. ox.

